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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1003 | $title = str_replace('%title', $post->post_title, $title); |
| 1004 | $title = str_replace('%date', $date, $title); |
| 1005 | $title = apply_filters('the_title', $title, $post); |
| 1006 | |
| 1007 | $link = $previous ? "<link rel='prev' title='" : "<link rel='next' title='"; |
| 1008 | $link .= esc_attr( $title ); |
| 1009 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1010 | |
| 1011 | $adjacent = $previous ? 'previous' : 'next'; |
| 1012 | return apply_filters( "{$adjacent}_post_rel_link", $link ); |
| 1013 | } |
| 1014 | |
| 1015 | /** |
| 1016 | * Display relational links for the posts adjacent to the current post. |
| 1017 | * |
| 1018 | * @since 2.8.0 |
| 1019 | * |
| 1020 | * @param string $title Optional. Link title format. |
| 1021 | * @param bool $in_same_cat Optional. Whether link should be in same category. |